FEL2012 - List of Authors (Bielawski, S.)

Paper

Title

Page

Sensitivities of FEL Parameters in LUNEX5 in France by GENESIS Simulation

233

T. Tanikawa, M.-E. Couprie, M. Labat, A. Loulergue
SOLEIL, Gif-sur-Yvette, France
S. Bielawski, C. Evain, C. Szwaj
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France

LUNEX5 (free-electron Laser (FEL) Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at producing short and intense laser pulse in the soft x-ray region (target wavelength is 13 and 20 nm). This FEL comports either a conventional linear accelerator or a laser wakefield accelerator, and includes innovative schemes such an echo-enable harmonic generation and higher-order harmonics seeding generated in gases to obtain the high spatio-temporal coherent radiation. Sensitivities of FEL radiation property to parameter such as beam energy, energy spread, bunch length, input seed power have been studied by using GENESIS.

TUPD17

Seeding of SPARC-FEL with a Tunable Fibre-based Source

269

N.Y. Joly
University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany
S. Bielawski
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
W. Chang, P. Hölzer, K. Mak, P.St.J. Russell, F. Tani, J.C. Travers
Max Planck Institute for the Science of Light, Erlangen, Germany
F. Ciocci, L. Giannessi, A. Petralia, M. Quattromini
ENEA C.R. Frascati, Frascati (Roma), Italy
M.-E. Couprie, M. Labat, T. Tanikawa
SOLEIL, Gif-sur-Yvette, France
G. De Ninno, B. Mahieu
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
G. Gatti
INFN/LNF, Frascati (Roma), Italy
V. Petrillo
Istituto Nazionale di Fisica Nucleare, Milano, Italy
J.V. Rau
ISM-CNR, Rome, Italy

Instead of seeding a free electron laser in the UV-VUV with a frequency doubled or tripled laser or high order harmonics, here we investigate and present the first results on seeding SPARC-FEL with a fiber-based tunable ultraviolet source. The seed generation system consists of a kagomé hollow-core photonic crystal fiber filled with noble gas. Diffraction-limited DUV pulses of >50 nJ and fs-duration which are continuously tunable from below 200 nm to above 300 nm are generated. The process is based on soliton-effect self-compression of the pump pulse down to a few optical cycles, accompanied by the emission of a resonant dispersive wave in the DUV spectral region. The quality of the compression highly depends on the pump pulse duration, and ideally, pulses <60 fs should be used. Our experimental set-up and associated GENESIS simulations enable us to study the utility of the seed tunability, and the influence of the seed quality, on the performance of the SPARC-FEL in the 200-300 nm range.

WEOB03

Laser-induced CSR : Seeding of the Microbunching Instability in Storage Rings

E. Roussel, S. Bielawski, C. Evain, C. Szwaj, T. Tanikawa
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
M. Adachi, M. Katoh
UVSOR, Okazaki, Japan
M. Hosaka, N. Yamamoto
Nagoya University, Nagoya, Japan
M. Le Parquier
CERLA, Villeneuve d'Ascq, France
H. Zen
Kyoto University, Institute for Advanced Energy, Kyoto, Japan

Microbunching instability arises both in Linear Free Electron Laser and in storage rings due to the interaction of the electrons with their own radiation, mainly in dipoles (bending magnets in storage rings and chicanes in linear FEL). This instability leads to the formation of micro-structures in the longitudinal phase-space (typically in the mm range in the longitudinal profile) and limits the performances of these accelerator based ligth sources. We show that the interaction of the electron bunch with an external laser pulse, whose envelope is modulated at a Terahertz frequency (associated to mm wavelength), allows to investigate the dynamics of electron bunches in storage rings during the micro-bunching instability. Here, we achieve experiments at UVSOR-II* around the CSR instability threshold. We also perform numerical calculations using a one-dimensional Fokker-Planck-Vlasov modeling taking into account CSR wakefield. This seeding mechanism highlights that CSR depends on the wakefields for some ranges of excited wavenumber.
* C. Evain et al., Phys. Rev. ST Accel. Beams 13, 090703 (2010); S. Bielawski et al., Nature Physics 4, 390 (2008).

Slides WEOB03 [2.523 MB]

FROA03

The LUNEX5 Project

678

M.-E. Couprie
CEA/DSM, Gif-sur-Yvette, France
C. Benabderrahmane, P. Betinelli-Deck, F. Bouvet, A. Buteau, L. Cassinari, J. Daillant, J.-C. Denard, C. Evain, P. Eymard, B. Gagey, C. Herbeaux, M. Labat, A. Lestrade, A. Loulergue, P. Marchand, O. Marcouillé, J.L. Marlats, C. Miron, P. Morin, A. Nadji, F. Polack, J.B. Pruvost, F. Ribeiro, J.P. Ricaud, P. Roy, T. Tanikawa
SOLEIL, Gif-sur-Yvette, France
S. Bielawski, C. Szwaj
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
B. Carré
CEA, Gif-sur-Yvette, France
J. Chavanne, L. Farvacque, G. Lebec
ESRF, Grenoble, France
X. Davoine
CEA/DAM/DIF, Arpajon, France
G. Devanz, M. Luong
CEA/DSM/IRFU, France
A. Dubois, J. Lüning
CCPMR, Paris, France
G. Lambert, R. Lehe, A. Lifschitz, V. Malka, A. Rousse, K. Ta Phuoc, C. Thaury
LOA, Palaiseau, France
R. Roux
LAL, Orsay, France

LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at investigating the production of short, intense, and coherent pulses in the soft X-ray region (with two particular targeted wavelengths of 20 and 13 nm on the fundamental wavelength). The project consists of a Free Electron Laser (FEL) line enabling the most advanced seeding configurations (High order Harmonic in Gas seeding and Echo Enable Harmonic Generation) and in-vacuum (potentially cryogenic) undulators of 15 and 30 mm period. Two accelerator types feed this FEL line : a Conventional Linear Accelerator (CLA) with superconducting cavities of 400 MeV for the investigations of the advanced FEL schemes, compatible with a future up-grade for high repetition rate; and a 0.4 - 1 GeV Laser Wake Field Accelerator (LWFA), to be qualified in view of FEL application, in the single spike or seeded regime. Two pilot user experiments for time-resolved studies of isolated species and solid state matter dynamics will take benefit of LUNEX5 FEL radiation and provide feedback of the performance of the different schemes under real user conditions.

Slides FROA03 [25.321 MB]

FROBI01

Towards Compact Short FEL Sources : Seeding and LWFA based FEL

M. Labat, M.-E. Couprie, A. Loulergue
SOLEIL, Gif-sur-Yvette, France
S. Bielawski
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
G. De Ninno
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
L. Giannessi
ENEA C.R. Frascati, Frascati (Roma), Italy
N.Y. Joly
University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany
P.St.J. Russell
Max Planck Institute for the Science of Light, Erlangen, Germany

The seeding technique, proposed to improve the FEL temporal coherence and to enable more compact schemes, progressed significantly during this last decade. After conventionnal laser sources, eventually doubled or tripled in crystal, high order harmonics generated in gas were successfully used, bringing FELs in the XUV range. We are now involved in the demonstration of a new scheme, using fiber based tunable ultraviolet source. Its output power and tunability are of high interest. Last results obtained with the MaxPlanck Institute and the SPARC teams are presented. Seeding can lead to complex dynamics between the electron and the light pulse. Numerical studies revealed possible pulse splitting effects. We will report on their possible observation in collaboration with the FERMI team. Future FELs may also rely on emerging accelerators generated by laser wakefiled acceleration. Recently, the LUNEX5 project was proposed in France. It consists in one undulator line, fed by either a conventionnal LINAC or a laser wakefield accelerator (LWFA), to deliver XUV fs pulses to pilot user experiments. Preliminary work on radiation optimization of an FEL based on a LWFA will be also presented.

Paper	Title	Page
TUPD05	Sensitivities of FEL Parameters in LUNEX5 in France by GENESIS Simulation	233
	T. Tanikawa, M.-E. Couprie, M. Labat, A. Loulergue SOLEIL, Gif-sur-Yvette, France S. Bielawski, C. Evain, C. Szwaj PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
	LUNEX5 (free-electron Laser (FEL) Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at producing short and intense laser pulse in the soft x-ray region (target wavelength is 13 and 20 nm). This FEL comports either a conventional linear accelerator or a laser wakefield accelerator, and includes innovative schemes such an echo-enable harmonic generation and higher-order harmonics seeding generated in gases to obtain the high spatio-temporal coherent radiation. Sensitivities of FEL radiation property to parameter such as beam energy, energy spread, bunch length, input seed power have been studied by using GENESIS.

TUPD17	Seeding of SPARC-FEL with a Tunable Fibre-based Source	269
	N.Y. Joly University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany S. Bielawski PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France W. Chang, P. Hölzer, K. Mak, P.St.J. Russell, F. Tani, J.C. Travers Max Planck Institute for the Science of Light, Erlangen, Germany F. Ciocci, L. Giannessi, A. Petralia, M. Quattromini ENEA C.R. Frascati, Frascati (Roma), Italy M.-E. Couprie, M. Labat, T. Tanikawa SOLEIL, Gif-sur-Yvette, France G. De Ninno, B. Mahieu Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy G. Gatti INFN/LNF, Frascati (Roma), Italy V. Petrillo Istituto Nazionale di Fisica Nucleare, Milano, Italy J.V. Rau ISM-CNR, Rome, Italy
	Instead of seeding a free electron laser in the UV-VUV with a frequency doubled or tripled laser or high order harmonics, here we investigate and present the first results on seeding SPARC-FEL with a fiber-based tunable ultraviolet source. The seed generation system consists of a kagomé hollow-core photonic crystal fiber filled with noble gas. Diffraction-limited DUV pulses of >50 nJ and fs-duration which are continuously tunable from below 200 nm to above 300 nm are generated. The process is based on soliton-effect self-compression of the pump pulse down to a few optical cycles, accompanied by the emission of a resonant dispersive wave in the DUV spectral region. The quality of the compression highly depends on the pump pulse duration, and ideally, pulses <60 fs should be used. Our experimental set-up and associated GENESIS simulations enable us to study the utility of the seed tunability, and the influence of the seed quality, on the performance of the SPARC-FEL in the 200-300 nm range.

WEOB03	Laser-induced CSR : Seeding of the Microbunching Instability in Storage Rings
	E. Roussel, S. Bielawski, C. Evain, C. Szwaj, T. Tanikawa PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France M. Adachi, M. Katoh UVSOR, Okazaki, Japan M. Hosaka, N. Yamamoto Nagoya University, Nagoya, Japan M. Le Parquier CERLA, Villeneuve d'Ascq, France H. Zen Kyoto University, Institute for Advanced Energy, Kyoto, Japan
	Microbunching instability arises both in Linear Free Electron Laser and in storage rings due to the interaction of the electrons with their own radiation, mainly in dipoles (bending magnets in storage rings and chicanes in linear FEL). This instability leads to the formation of micro-structures in the longitudinal phase-space (typically in the mm range in the longitudinal profile) and limits the performances of these accelerator based ligth sources. We show that the interaction of the electron bunch with an external laser pulse, whose envelope is modulated at a Terahertz frequency (associated to mm wavelength), allows to investigate the dynamics of electron bunches in storage rings during the micro-bunching instability. Here, we achieve experiments at UVSOR-II* around the CSR instability threshold. We also perform numerical calculations using a one-dimensional Fokker-Planck-Vlasov modeling taking into account CSR wakefield. This seeding mechanism highlights that CSR depends on the wakefields for some ranges of excited wavenumber. * C. Evain et al., Phys. Rev. ST Accel. Beams 13, 090703 (2010); S. Bielawski et al., Nature Physics 4, 390 (2008).
	Slides WEOB03 [2.523 MB]

FROA03	The LUNEX5 Project	678
	M.-E. Couprie CEA/DSM, Gif-sur-Yvette, France C. Benabderrahmane, P. Betinelli-Deck, F. Bouvet, A. Buteau, L. Cassinari, J. Daillant, J.-C. Denard, C. Evain, P. Eymard, B. Gagey, C. Herbeaux, M. Labat, A. Lestrade, A. Loulergue, P. Marchand, O. Marcouillé, J.L. Marlats, C. Miron, P. Morin, A. Nadji, F. Polack, J.B. Pruvost, F. Ribeiro, J.P. Ricaud, P. Roy, T. Tanikawa SOLEIL, Gif-sur-Yvette, France S. Bielawski, C. Szwaj PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France B. Carré CEA, Gif-sur-Yvette, France J. Chavanne, L. Farvacque, G. Lebec ESRF, Grenoble, France X. Davoine CEA/DAM/DIF, Arpajon, France G. Devanz, M. Luong CEA/DSM/IRFU, France A. Dubois, J. Lüning CCPMR, Paris, France G. Lambert, R. Lehe, A. Lifschitz, V. Malka, A. Rousse, K. Ta Phuoc, C. Thaury LOA, Palaiseau, France R. Roux LAL, Orsay, France
	LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at investigating the production of short, intense, and coherent pulses in the soft X-ray region (with two particular targeted wavelengths of 20 and 13 nm on the fundamental wavelength). The project consists of a Free Electron Laser (FEL) line enabling the most advanced seeding configurations (High order Harmonic in Gas seeding and Echo Enable Harmonic Generation) and in-vacuum (potentially cryogenic) undulators of 15 and 30 mm period. Two accelerator types feed this FEL line : a Conventional Linear Accelerator (CLA) with superconducting cavities of 400 MeV for the investigations of the advanced FEL schemes, compatible with a future up-grade for high repetition rate; and a 0.4 - 1 GeV Laser Wake Field Accelerator (LWFA), to be qualified in view of FEL application, in the single spike or seeded regime. Two pilot user experiments for time-resolved studies of isolated species and solid state matter dynamics will take benefit of LUNEX5 FEL radiation and provide feedback of the performance of the different schemes under real user conditions.
	Slides FROA03 [25.321 MB]

FROBI01	Towards Compact Short FEL Sources : Seeding and LWFA based FEL
	M. Labat, M.-E. Couprie, A. Loulergue SOLEIL, Gif-sur-Yvette, France S. Bielawski PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France G. De Ninno Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy L. Giannessi ENEA C.R. Frascati, Frascati (Roma), Italy N.Y. Joly University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany P.St.J. Russell Max Planck Institute for the Science of Light, Erlangen, Germany
	The seeding technique, proposed to improve the FEL temporal coherence and to enable more compact schemes, progressed significantly during this last decade. After conventionnal laser sources, eventually doubled or tripled in crystal, high order harmonics generated in gas were successfully used, bringing FELs in the XUV range. We are now involved in the demonstration of a new scheme, using fiber based tunable ultraviolet source. Its output power and tunability are of high interest. Last results obtained with the MaxPlanck Institute and the SPARC teams are presented. Seeding can lead to complex dynamics between the electron and the light pulse. Numerical studies revealed possible pulse splitting effects. We will report on their possible observation in collaboration with the FERMI team. Future FELs may also rely on emerging accelerators generated by laser wakefiled acceleration. Recently, the LUNEX5 project was proposed in France. It consists in one undulator line, fed by either a conventionnal LINAC or a laser wakefield accelerator (LWFA), to deliver XUV fs pulses to pilot user experiments. Preliminary work on radiation optimization of an FEL based on a LWFA will be also presented.